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参数资料
| 型号： | NCP3218MNR2G |
| 厂商： | ON Semiconductor |
| 文件页数： | 19/35页 |
| 文件大小： | 0K |
| 描述： | IC CTLR BUCK 7BIT 3PHASE 48QFN |
| 标准包装： | 2,500 |
| 应用： | 控制器，Intel IMVP-6.5? |
| 输入电压： | 3.3 V ~ 22 V |
| 输出数： | 1 |
| 输出电压： | 0.013 V ~ 1.5 V |
| 工作温度： | -40°C ~ 100°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 48-WFQFN 裸露焊盘 |
| 供应商设备封装： | 48-QFN（6x6） |
| 包装： | 带卷 (TR) |
| 其它名称： | NCP3218MNR2G-ND NCP3218MNR2GOSTR |
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ADP3212, NCP3218, NCP3218G
Output Crowbar
To prevent the CPU and other external components from
damage due to overvoltage, the APD3212/NCP3218/
Inductor
Current
Switch
Node
Voltage
t 0 t 1 t 2 t 3 t 4
Figure 26. Inductor Current and Switch Node in DCM
4
OUTPUT VOLTAGE
20 mV/DIV
SWITCH NODE 5 V/DIV
NCP3218G turns off the DRVH1 and DRVH2 outputs and
turns on the DRVL1 and DRVL2 outputs when the output
voltage exceeds the OVP threshold (1.55 V typical).
Turning on the low ? side MOSFETs forces the output
capacitor to discharge and the current to reverse due to
current build up in the inductors. If the output overvoltage
is due to a drain ? source short of the high ? side MOSFET,
turning on the low ? side MOSFET results in a crowbar
across the input voltage rail. The crowbar action blows the
fuse of the input rail, breaking the circuit and thus protecting
the microprocessor from destruction.
When the OVP feature is triggered, the APD3212/
NCP3218/NCP3218G is latched off. The latchoff function
can be reset by removing and reapplying VCC to the
APD3212/NCP3218/NCP3218G or by briefly pulling the
EN pin low.
Pulling TTSNS to less than 1.0 V disables the overvoltage
protection function. In this configuration, VRTT should be
tied to ground.
Reverse Voltage Protection
Very large reverse current in inductors can cause negative
V CORE voltage, which is harmful to the CPU and other
output components. The APD3212/NCP3218/NCP3218G
2
3
1
INDUCTOR CURRENT
5 A/DIV
LOW ? SIDE GATE DRIVE 5 V/DIV
provides a Reverse Voltage Protection (RVP) function
without additional system cost. The V CORE voltage is
monitored through the CSREF pin. When the CSREF pin
voltage drops to less than ? 300 mV, the APD3212/
NCP3218/NCP3218G triggers the RVP function by
disabling all PWM outputs and driving DRVL1 and DRVL2
low, thus turning off all MOSFETs. The reverse inductor
currents can be quickly reset to 0 by discharging the built ? up
2 μ s/DIV
Figure 27. Single ? Phase Waveforms in DCM with 1 A
Load Current
400
energy in the inductor into the input dc voltage source via the
forward ? biased body diode of the high ? side MOSFETs. The
RVP function is terminated when the CSREF pin voltage
returns to greater than ? 100 mV.
Sometimes the crowbar feature inadvertently causes
350
300
250
200
9 V INPUT
19 V INPUT
output reverse voltage because turning on the low ? side
MOSFETs results in a very large reverse inductor current. To
prevent damage to the CPU caused from negative voltage,
the APD3212/NCP3218/NCP3218G maintains its RVP
monitoring function even after OVP latchoff. During OVP
latchoff, if the CSREF pin voltage drops to less than
150
100
50
0
0 2 4 6 8 10 12 14
LOAD CURRENT (A)
Figure 28. Single ? Phase CCM/DCM Frequency vs.
Load Current
? 300 mV, the low ? side MOSFETs is turned off. DRVL
outputs are allowed to turn back on when the CSREF voltage
recovers to greater than ? 100 mV.
Output Enable and UVLO
For the APD3212/NCP3218/NCP3218G to begin
switching, the VCC supply voltage to the controller must be
greater than the V CCOK threshold and the EN pin must be
driven high. If the VCC voltage is less than the V CCUVLO
threshold or the EN pin is a logic low, the
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相关代理商/技术参数 |
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| NCP330MUTBG | 功能描述:电源开关 IC - 配电 3A LOAD SWITCH RoHS:否 制造商:Exar 输出端数量:1 开启电阻（最大值）:85 mOhms 开启时间（最大值）:400 us 关闭时间（最大值）:20 us 工作电源电压:3.2 V to 6.5 V 电源电流（最大值）: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOT-23-5 |
| NCP3334DADJG | 功能描述:低压差稳压器 - LDO ANA 500mA ADJ LDO RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
| NCP3334DADJG | 制造商:ON Semiconductor 功能描述:Linear Voltage Regulator IC |
| NCP3334DADJR2G | 功能描述:低压差稳压器 - LDO ANA 500mA ADJ LDO RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
| NCP3335ADM150R2G | 功能描述:低压差稳压器 - LDO ANA 500MA ANY CAP LDO RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
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